I'd like to announce CELT version 0.9.1. There have been many quality enhancements since 0.8.x and even more so since the last version announced on HA. You can get it from the CELT website. Also, CELT is now a component of the Opus codec, which is in the process of being standardized by the IETF as a lossy audio codec for interactive applications.

Also, for those who would like to help, we are looking for volunteers to help tune the codec. The bit-stream is (finally) about to be frozen, so any quality improvements we can get before then is useful. No highly specialized skills required, just good critical listening abilities. As a first round, I'd be interested in comments and rankings of the following four audio files:

The bit-rate is fairly low (64 kb/s), so artefacts are easy to hear. This is the original (uncompressed) file. I'm interested in a quality ranking of all these four files (especially the ones that sound similar). I'll reveal the contents of these files after people have responded.

I have downloaded this snapshot, how to compile celt-0.11.4.tar.gz to exe and dlls (32bit)?

Assuming you are on Windows with MSVC < 10:

1. open MSVS and make empty project for libcelt from files from libcelt folder and build it2. download libogg and build it3. make separate projects for celtenc and celtdec* with linker dependant on already build libcelt and libogg libraries* from files in tools folder (read Makefile.am as a help)

If you setup everything in those steps correctly, you should have celtenc and celtdec executables

I have downloaded this snapshot, how to compile celt-0.11.4.tar.gz to exe and dlls (32bit)?

Assuming you are on Windows with MSVC < 10:

1. open MSVS and make empty project for libcelt from files from libcelt folder and build it2. download libogg and build it3. make separate projects for celtenc and celtdec* with linker dependant on already build libcelt and libogg libraries* from files in tools folder (read Makefile.am as a help)

If you setup everything in those steps correctly, you should have celtenc and celtdec executables